The ancient Japanese sport of sumo is in well-documented crisis. Years of controversy and scandal have hurt the sport's ability to attract new talent. But new energy is brewing in Tokyo's Ryōgoku district, where the sport is slowly adapting to life in the 21st century, and where - despite being banned from the professional ring itself - women are flocking to watch it like never before. Will it be enough to save Japan's national sport in the 21st century?
10 of the best books set in Japan – that will take you there